Socket That Updates App Still Function In The Background?
Nov 17, 2009If I use NotifyIcon in my project, will my socket that updates my app still function in the background?
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.Net Properly Shutdown An Asynchronous Socket Server Running On A Background Worker?
Mar 21, 2012I have a Class called SocketSvr which handles an asynchronous socket server. It is called via the BackgroundWorker from my main form. Basically, I just want it to display my socket data information inside a textbox in the main form, and have a server start/stop button available on the main form to do those things.
Here is the code from Form1.vb:
Public Class Form1
Dim WithEvents Socketsvr As New SocketSvr
Private Sub ToggleServerButton_Click(ByVal sender As System.Object, _
[code]....
I am uncertain how to properly shut down requests from the client when the StopServer() function is run. In the code above, I place a cancellation queue for the background process. The funny thing is that once StopServer() is run, it will accept one more connection, then stop accepting thereafter.If I remove the following line from the code above:
listener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1)
-- it crashes when I attempt to start the server a second time (complaining that I cannot reuse the socket, obviously) My guess is that I need to add something to the bw.CancellationPending call on the background worker?
Identify Connection Lost Between Socket Server And Socket Client?
May 21, 2011I wrote a Socket Client which will send the Socket Server some data and get some response from Server. This process will be running once in every 2 seconds.
Now what I need to know is How we can identify the connection lost between Server and Client?
I need this to be implemented in the Client side. If there is no connection then Client should automatically close the connection. Once the connection with the server is available in the next attempt it should connect automatically.
Run Function In Background?
Oct 23, 2011I am developing app in VB.NET that should have HTML requests and getting responses as string. Now I am using this code:
[Code]...
But when I run this code, my program froze for a little bit, until this URL content is loaded. I searched over google and I didn't find anything about this. I tried using Classes and Modules, but with both of those it's frizzing again. Can someone explain me how to run this in background, so program won't froze, and when it get's downloaded to return data?
Function In Form To Run In Background?
Mar 17, 2011How do I let the function in a form run in the background without slowing down/stopping my entire application until it has finished?
View 7 RepliesRun A Function As A Background Worker?
Jun 6, 2010I have a function it is called ReLoad()
How can i run it as a background worker? so it can run in the background where it does not effect my current running function - basicly so the form will not freeze at all.
VS 2005 Run A Function In The Background?
May 17, 2010I have a datagrid with a list of items. Each item has an url for a picture. For each item I have to download the picture from the url, and then show it in the grid. This takes quite a long time, and freezes my application while running.
Is it possible to do this in the background, while allowing the user to take other actions? For example, scrolling down the list to see the items that have been loaded. Or clicking on an item in the list, which calls another function. Maybe doing something on a different form. And doing this while the list continues to load in the background.
Invoke Parameterized Function Delegate From Background To UI Thread?
Oct 4, 2010What is the Invoke syntax to marshall data from a background thread receive callback method to a function on the UI Thread?(Form1).
Public Class Form1
MyDelegate = New DisplayData(AddressOf DisplayData)
Private Sub Form1_Load()
MyDelegate = New DisplayData(AddressOf DisplayData)
[code]....
Client Socket - Send Message Through Client Socket Receive Specified Argument Was Out Of Range Of Valid Values
Oct 15, 2011Below is my code, but when i send the message thru client socket i receive Specified argument was out of the range of valid values. Parameter name: size
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim serverStream As NetworkStream = clientSocket.GetStream()
Dim outStream As Byte() = _
System.Text.Encoding.ASCII.GetBytes("0800822000000000000004000000000000000920092126012345001")
[CODE]...
VS 2010 Function For Changing Picturebox Background Image With String?
Mar 1, 2012What I have done is named a bunch of picture boxes "Q," "W," "E," etc. (the whole alphabet) and named picture that correspond to these picture boxes ("Q.png," "W.png," and so on) and added them to my resources.
For example, the following code would give the picture box named "Q" it's corresponding image "Q.png":
vb
Q.BackgroundImage = My.Resources.Q
Of course, it's kind of a pain in the backside to copy and paste this code and change all the Q's to W's and so on, so I was hoping to create a function to do the job for me:
vb
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'So that I can run the letter as a string through the function,
[Code].....
Hopefully I've provided enough detail so that it is obvious what I'm trying to do.
Obviously, the code I tried above (the second block) doesn't work - it gives a syntax error. I need to change/write to make this function functional.
Dynamically Call A Function With Delegates By Passing A String To A Background Thread?
May 20, 2009How do I dynamically call a function with delegates by passing a string to a background thread in VB.NET?
Currently my code is this
Public Sub invertImageBK(ByVal image As Bitmap)
Dim snxl As System.ComponentModel.BackgroundWorker = createBW()
snxl.RunWorkerAsync(New ImageProperties(image.Clone, "invertImage", Nothing))
[Code].....
Function Returns UI Thread Value To Background Thread?
Dec 4, 2008A non-UI thread in my prog needs to obtain data from a UI listview control. To prevent cross-thread errors I use the following, but it freezes the prog (probably because the "Else" part is never called).What am I doing wrong?
[Code]...
VB Image - Transparent Parts Dont See Form As Background But Marioland As Background?
Feb 18, 2011Background of form: black
background of char, bombs and shrooms: transparent
picbox behind char, bombs and shrooms is regular (marioland)
How can i fix it so the transparent parts dont see form as background but marioland as background?
Multithreading - Load Data In Background Mode Using Background Worker?
May 3, 2012I am using query from a SQLite database as the AutocompleteCustomSource for a ComboBox. Also, I want to load data in separate thread. My LoadData method works fine when called directly, but it fails when it is called from the BackgroundWorker thread. When it is called from the background thread, it throws a Specified cast is not valid exception on the csearch.AutoCompleteCustomSource.Add(hh("Taj")) line. Below is my code:
Sub LoadData()
Dim connetionString As String
Dim cnn As SQLiteConnection
[Code].....
Background Image Will Not Switch Back From The Plain Background Color Of "control"?
Feb 19, 2011what I am trying to accomplish worked with the code in the last thread I posted a while back. I still am using this code, however, I changed the window size to work better and gave it a nicer background for the title screen of my project. Now what I am working on at the moment is making a settings form that has 2 labels. One for "Default" Layout and one for "Plain" layout. When default is at start, the default label is disabled,and when plain layout is clicked, the button is disabled and default button is enabled.Basically, this is a toggle switch for default or plain where if one is enabled, the option for it is disabled and the other is enabled.My problem is that when I switch from Plain back to default, the background Image will not switch back from the plain background color of "control"Here is my code:
Public Class Settings
Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
MiDNiGHT.BackgroundImage = Nothing[code].......
First Row Updates But Not The OneI Specify?
Dec 15, 2011I am currently working with a vb2010 front end with access as the database. everything works for accessing the information adding information. But when I try to edit/update the contents of a row I find that the update is being applied to the first row of the table rather than the target row. i have tried using the ID as a way to specify the row i want updated but that doesn't appear to work.
UPDATE ExamContent
SET Question = ?, ExamsText = ?, [Answer 1] = ?, [Answer 2] = ?, [Answer 3] = ?, [Answer 4] = ?, CORRECT = ?, LastEditUser = ?, LastEditDate = ?
[code].....
Put Your Updates Into Action?
Sep 30, 2009I know there are several ways to publish updates but I would like to know the best way to do it. What I already have configured is a shard network folder which I intend to have the program update from there. What would the best way to publish updates to the folder be?
View 1 RepliesTextbox Updates Only Once
Apr 29, 2009In the following code, TextBox5 reports conditions while the mouse is moving over the form, and TextBox7 reports only when the mouse has STOPPED moving over the form. When I start the program, and move the mouse from outside the form, onto the form and don't stop the mouse, the coords continually update in TextBox5 as expected. When I then stop the mouse, TextBox5 clears and TextBox7 reports, "Mouse Hovering", also as expected. Then if I start moving the mouse again, TextBox7 clears, and TextBox5 starts displaying mouse coords again, as expected.
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How To Pass A Function To A Function Is Functors/function Objects Avaiable In VB2010
Oct 12, 2011I want to make an numerical integration method with takes in an analytic function and integrate it over a specific interval. For the numerical integration procedure I want to use some procedures in nr.com. The problem is that these are programmed in C++ and they uses functors to pass a function to the integration method. How can I do this in VB 2010?
I want to initialize the function (i.e. set a=1,b=0 for function y(x)=a*x+b) and then pass the function to the integration method. Then when the integration method call the function it only calls the function with one parameter (i.e. x since a,b is already set)
What is the best way to do this in VB2010?I want to make a general integration method where I can pass any single valued function and integration limits.
I have just started using VB, and from what I have found so far it seems like the tools you have is
- to us a delegate for the function
- to use a lambda expression for the function
- send a pointer/adressOf
- to create a function class/structure and submit this to the function
As for now I am most inclined to create a function-class. But I am not really sure how.F.ex. I make different classes for each "uniqe function" I want to integrate, but how can I pass them to the integration function when I need to specify the argument type in the integration-function-call?This seems like a basic problem which applies to many Math operations, so I think it would be very useful to clarify this.
.net - Updates To A Single Datatable Row?
Jun 16, 2011Why does the first method below work? I would have thought that the variable 'row' is completely separate from anything else, such as a row in DataTable1. Also, is there a drawback to using the first method? For changes to lots of columns in a single row, I'd rather do it that way.
[Code]...
Add User Updates To A Database?
Dec 15, 2011I got the printing. Now how can I allow users to update the database, such as Add, Change, or Delete records accordingly? Then I am finished with my project.
View 1 RepliesCheck For Updates And If There Is An Update
Apr 4, 2009Alright, when I open my program I want it to check for updates and if there is an update I want it to download. So far I have a text file saying the most recent version and then it downloads that file and compares it to the current file version. If the current file version < recent version then it will download the file. :O Can someone help me with the code? :3 I have a hosting server with direct download links.
View 5 RepliesCheck For Updates From A Website?
May 4, 2011I'm unsure of how realistic it is for this to work but I know a lot is possible in vb. I have an application called WindowsPRO available from my filesharewebsit This application is intended for those in school to easily be able to do several daily tasks such as calculate and use notepad within one window. I have been working on this application in part with the help of MSDN.Back OT, currently when I click the "Check for updates" I use process.start to open my website. Not very complicated is it. What I want to do is open a form in whichchecks for the update from my site. Whenever I upload a file, I'll upload it as a .zip onto my site and always name it like: "Application name v1.0" or whatever the version number is. That is the only thing that changes.
When the user presses the check for updates, I want to checkhe site in background for a "higher" version number. If my application is v1.2, I want it to check for anything higher than 1.2. So if I have on the site 1.2.2, or 1.3, I want it to check for the highest number version and download it.My question simply is, how do I check for a "higher version" from a website?
Check For Updates In Database
Aug 26, 2011how to check if a field( a cell within a database for talk sake date of birth) has been edited in the past then flag it now this field may not be change for a year but how do i keep a record of that and the flag it if it is change.
View 1 RepliesDataAdapter Not Writing Updates
Sep 29, 2009I'm trying to create a form that uses controls that are bound at runtime. All the data objects are declared at the form level. The Select statement includes the two fields that make up the PK form the table. The Owing_Company data displays in the bound control. I can change the text and in Save_Click the RowState is Modified and Row!Owning_company has the changed data. DsForm.HasChanges is False. A simple call in Save_Click daForm.Update(dsForm) does not change the DB. If I update the Row!Owning_Company in code dsForm.HasChanges is now true and daForm.Update changes the data. What am I missing that allows changes made via the bound control to modify the DataSet?
[Code]....
Datagridview Updates 1st Row Instead Of Insert Into A New Row?
Mar 1, 2012I have a Form with textboxes and a datagridview, the textboxes are to fill a new row in the datagridview but in stead it is updating the first row, the following is my code
[Code]...
DateTimePicker Updates The Value A Bit Too Early?
Sep 1, 2009I'm using a DateTimePicker (.net).Is there a way to update the value only when the calendar closes?Or is there a way to know when the calendar open/closes?The DateTimePicker is bound to an object and this object check the dates and pop a message box when needed. When the user is browsing for a date, the message box appears. I only want this rule to execute when the date is chosen
View 1 RepliesGet A Program To Check For Updates?
Aug 20, 2010I don't like to build myprogram to a click-onceapplication becauseI lose the .exe and I don't know how to edit it after building it. So unless someone this, here is my main question:I was thinking about updating a .txt file that have uploaded somewhere that has the current available version. Can I use streamreader for an online file? And if so, if the available version is updated, how can I edit the code and everything to updatethe file?
View 14 RepliesMore Windows Updates Convert To .NET?
Jan 31, 2011Currently converting the infamous Windows Update VB Script examples to VB .NET so that I can have a more polished GUI for our end user's as we have to nofity them every step of the way when installing updates (so the built in WUA interaction is not viable for us).
Converting from VBS to VB .NET seems to be more troublesome then I estimated, FYI I am no a full time .NET programmer so I might be making newbie mistakes!!!
So here is the VB Script example from MSDN for searhing, downloading and installing Windows updates using VBS:
[Code]...
MS Updates And Ambiguous In Namespace 'asp'?
Jun 1, 2010We have a VB web application that for some reason breaks when some clients run Windows Updates. To resolve the issue we have to force the application to recompile on the servers where the application is installed. In some instances we must do this multiple times and/or restart IIS as well to resolve the issue.
This didn't start happening until October of 2009, and then suddenly it happened all the time... but not for every client, and not with every update. It continues to happen and we have been at a loss to understand why. Is anyone else experiencing this issue or found a way around it? If there is something in our code that we can alter to keep this from happening I would love to know about it, as we spend time and resources troubleshooting and resolving an issue that doesn't exist until a Windows update runs and our application becomes un-usable until resolved.